Add forward vs adjoint flux comparison to FW-CADIS task#473
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The FW-CADIS notebook previously only plotted the adjoint-derived weight windows and left a placeholder markdown cell for plotting the flux. This attaches the mesh flux tally to the random ray model so that both the forward and adjoint solves record it, then adds a side by side plot of the forward flux and the adjoint (importance) flux, read from the forward and adjoint statepoints written by the single FW-CADIS run. The surrounding text is expanded to explain what each flux represents, why the random ray solver runs a forward pass before the adjoint pass, and how the weight windows relate to the adjoint flux.
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What
Adds a forward vs adjoint flux comparison to
tasks/task_14_variance_reduction/5_shielded_room_fw_cadis.ipynb.The notebook previously plotted only the FW-CADIS weight windows and left a placeholder markdown cell for plotting the flux. This change:
Why
Seeing the forward and adjoint flux together is the clearest way to build intuition for FW-CADIS: the forward flux collapses by orders of magnitude into the shield (which is why an analog run starves those regions), while the adjoint flux is highest in exactly those hard to reach regions, and the weight windows follow the adjoint importance.
Note
The forward solve statepoint is read from
statepoint.forward.<batch>.h5. This relies on OpenMC writing the forward solve output during an adjoint (FW-CADIS) random ray run, so the notebook needs a recent OpenMC.